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Achernar

Alpha Eridani

Proper NameAchernar
Bayer DesignationAlpha Eridani
Flamsteed NumberNone
HR (BSC)472
HD10144
ConstellationEridanus
Right Ascension1h 37m 43s
Declination-57° 14' 12"
Distance139 light years
43 parsecs
MagnitudeApparent: +0.5
Absolute: -2.8
Spectral ClassB3V Blue Dwarf
Optimum VisibilityOctober / November (Usually visible from southern latitudes)
NotesAn eclipsing binary of the Beta Lyrae type, with a white companion star

A blue dwarf star with an unusual spectrum, Achernar has a magnitude of +0.5, making it the brightest of the stars of Eridanus, and the ninth brightest in the entire sky.

Location of Achernar

Bright Achernar lies at the extreme southern tip of the star-river Eridanus, less than a degree from its southernmost border with neighbouring Hydrus.

Achernar

The River's End: brilliant blue Achernar, the ninth brightest star in the sky, lies at the southern tip of the star-river Eridanus.

HR Diagram
π Cephei
Polis
Pincoya
Nashira
Adhafera
Petra
ο1 Cygni
Absolutno
a Velorum
V2306 Ophiuchi
θ Hydrae
ζ Arae
YZ Ceti
Xi Boötis B
w Carinae
x Carinae
Sharjah
s Velorum A
41 Draconis
Struve 2398 A
Struve 2398 B
β Scupltoris
Gakyid
Nosaxa
b Velorum
AX Microscopii
HD 37131
Guniibuu
GX Andromedae
Berehynia
FL Virginis
Cerberus
Diya
Dombay
e Aquilae
Felixvarela
Ebla
ε Indi
Erakis
Koeia
Koit
Kruger 60 A
DO Cephei
La Superba
Kapteyn's Star
Copernicus
Mekbuda
Miram
LV Draconis
Alkaphrah
HR 5546
ι1 Scorpii
Naos
Alfirk
Aspidiske
HO Librae
ρ Cygni
Sargas
Azmidi
δ Caeli
61 Cygni A
Schedar
Deneb
Mira
δ Andromedae
Alchiba
Ran
δ Circini
Rigel
Mirfak
Rastaban
Ross 154
Mebsuta
Sadr
61 Cygni B
χ Cygni
52 Orionis
α Centauri A
Menkar
Arneb
Acubens
Castor B
Suhail
Sirius
Sirius B
U Sagittarii
15 Orionis
Lalande 18115
Tureis
Gliese 536
WX Ursae Majoris
Polaris
ο Capricorni B
14 Persei
BF Orionis
π5 Orionis
Betelgeuse
Avior
γ Pavonis
θ Circini
τ Ceti
β Pictoris
Teegarden's Star
Unurgunite
η Carinae
Hatysa
EE Leonis
Wolf 498
Wolf 359
Wezen
Antares
W Virginis
Capella
ν2 Canis Majoris
Canopus
Almaaz
van Maanen's Star
Achird
HR 7687
Enif
Proxima Centauri
β Doradus
Alnilam
BZ Crucis
UV Ceti
σ Orionis
ε Reticuli
Alnitak
Atria
Achernar

Hertzprung-Russell diagram plotting the temperature and luminosity of Achernar (marked by the red circle) relative to other stars.

Indexes

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